Why would I? My Pixel 6a still works just as well as it did when I got it and will receive security support for another 3 years. If I'm running GrapheneOS, it's not like I'm someone that cares about new Google features, most of which probably have privacy concerns.
If Google does another absurd deal like they did when I got my 6a where they practically gave the phone away, I might consider it since why not. Otherwise, no.
Regardless, I hate having new and expensive tech, especially for things I carry around with me that are prone to being lost, damaged, or stolen.